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Chapter: Power Quality : Voltage Sags and Interruptions

Voltage sags due to induction motor starting

1. Voltage sags can causes 2. Voltage sags due to Motor Starting:

Voltage sags due to induction motor starting:

 

1. Voltage sags can causes:

 

ü   Motor load to start/ stop

 

ü   Digital devices to reset causing loss of data

 

ü   Equipment damage and /or failure

 

ü   Materials spoilage

 

ü   Lost production due to downtime

 

ü   Additional costs

 

ü   Product reworks

 

ü   Product quality impacts

 

ü   Cost of investigations into problem

 

ü   Impacts on customer relations such as late delivery.

 

ü   Lost of sales

 

 

2. Voltage sags due to Motor Starting:

 

ü   Voltage sag produced by induction motor starting current is one of the main causes of sensitive equipment dropout.

 

ü   The use of motor starter reduces the voltage sag depth but increases its duration.

 

ü   The subsequent connection to full voltage originates new sag separated from the first one by a few seconds.

 

ü   An induction motor will draw six to ten times its full load current while starting.

 

ü   This lagging current then causes a voltage drop across the impedance of the system.

 

ü   Generally induction motors are balanced 3 phase loads, voltage sags due to their starting are symmetrical.

 

ü   Each phase draws approximately the same in rush current. The magnitude of voltage sag depends on,

 

ü   Characteristics of the induction motor

 

ü   Strength of the system at the point where motor is connected.

 




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